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Preimplantation genetic diagnosis (PGD) is a method to examine possible diseases of an embryo, prior to the implanantation into the uterus. PGD discovers the embryos at risk, but it requires in vitro fertilization (IVF). A cell is picked after the third day of fertilization of the embryo and the genom is extracted and analyzed for the presence of genetic abnormalities. The parents are the ones, who have to decide after what the embryo shall be analyzed.

With this method there is the possibility to avoid diseases. Healthy children will be born and disabilities would be eliminated. This sounds really good at the first sight. But of course, there are people who are against this method.